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Earnings Per Common Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive effect on computation of diluted earnings per common share | 15,000,000 | 30,000,000
Grant of long term stock awards | 1,000,000 | 1,000,000
Repurchase and retirement of common stock to offset the dilutive impact of long term stock awards | 1,700,000 |
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect | $ 35 |
Common stock outstanding under repurchase authorization | 22,600,000 |
Cash dividends per common share paid | $ 0.075 | $ 0.075
Cash dividends per common share declared | $ 0.075 | $ 0.075
Long-Term Stock Awards [Member] |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Grant of long term stock awards | 1,600,000 |

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